A compartment is a anatomically confining space which will resist tumour spread beyonds its boundaries
Intracompartmental
Intraosseous
Intra fascial compartments
Superficial to deep fascia
Parosseous
Extracompartmental
Extension beyond above
Pelvis
Popliteal fossae
Cubital fossa
Axilla
Musculoskeletal Tumour Society
Grade
Site
Metastasis
Grade
G0
benign
encapsulated or reactive bone
Stage
I latent
II active
III aggressive
GI
low grade malignant
pseudocapsule
microsat in reactive zone
GII
high grade malignant
microsatellites
skip mets beyond reactive zone
permiative margin
Codmans triangle
Site
TO intracapsular
TI extracapsular but intracompartmental
TII extracapsular & extracompartmental
Compartment = anatomic structure forming barrier to extension bone, cartilage or capsule
Metastasis
MO no mets
MI skip, regional or distant mets
Skip Metatasis
nodule of tumour separated from primary lesion by an intervening zone of normal non-reactive tissue are not the same as satellites found in the reactive zon
